For such an even-tempered series where relatively little happens, Mad Men has its fair share of bizarre moments.

Though it revolved around smooth-talking Don Draper's hedonistic lifestyle, the show also played into surprisingly macabre plot lines. Showrunner Matt Weiner was a writer and producer of The Sopranos, after all — he's used to delivering drama with a violent curveball or two.

Mad Men's jarring moments were vital; they prevented the series from being a monotonous replica of life in the 1960s. From the surreal to the downright grisly moments (and basically the entirety of season six), here are some of the darkest things that have ever happened on Mad Men.

13 dark 'Mad Men' moments

1. When Sally played in dry cleaning bags

Betty was never a particularly warm mother. That was set up from the beginning of Season 1, when she spots her daughter Sally running around and playing in a plastic dry cleaner bag -- and only cares about her potentially ruined dry-cleaned clothes, not that her daughter might suffocate to death.

Weiner recalls how shocking that scene was, saying in an AMC featurette: "the truth was, we used to play with those things all the time and they certainly resulted in some deaths."

2. When Freddy Rumsen peed his pants

Oh, Freddy Rumsen. Not as sleek as Don, witty as Roger or conniving as Pete. He was the bumbling goofball of Sterling Cooper (as it was then known), though his redeeming quality was championing Peggy's copywriting potential.

In Episode 9 of Season 2, Freddy gets way too drunk, pees his pants and passes out, right before a major meeting with Samsonite luggage. He's then forced to take a leave of absence.

(Freddy does eventually get his come-uppance though, opening the first scene of the final season with a stunning pitch for Accutron watches.)

3. That time Roger performed in blackface

Charming as he is, Roger Sterling often makes surprisingly casual racist comments that remind viewers just how different America was in the 1960s.

No moment was more uncomfortable for viewers than when Sterling sang in blackface to his young bride in Season 3, Episode 3 -- the show's boldest step thus far to address the ugly racial climate of the U.S. in the Civil Rights era.

4. The bloody office party

Here's a great idea! Have an office party with your coworkers, get drunk, then saddle up behind a lawnmower. Almost no one will get hurt.

In Episode 6 of Season 3, secretary Lois gets behind the wheel of a John Deere riding mower during an office party. Terrible at steering, she runs right over the foot of executive Guy MacKendrick. This might be the most blood we've ever seen on the show.

7. Fat Betty

At the start of Season five, audiences discover that former picture-perfect housewife Betty had piled on the pounds.

Trouble is, it didn't exactly look the way the show intended. Even Peggy's surprise pregnancy from season one was more realistic.

Betty's weight gain was such an odd turn for the character that fans couldn't help but mercilessly make fun of her (and it doesn't help that she's a divisive character already). "Fat Betty" became the target of the Internet's collective cruelty and one of the most hilariously confusing character arcs of the entire series.

8. When Peggy stabbed Abe.

What is it with Season 6? It's like a black hole of weird as hell Mad Men moments.

In Episode 9, Peggy's boyfriend, Abe, gets stabbed in her neighborhood. Peggy's paranoia goes into overdrive, and she builds a weird, makeshift spear to protect herself when she's alone at the apartment. One night, she accidentally stabs Abe in the stomach with it, thinking him an intruder.

Abe breaks up with Peggy on the way to the hospital.

*This was also the episode where Megan dons a white tee with an emblazoned red star on it, just like Sharon Tate once wore. That sparked a maelstrom of fan theories, culminating in the conclusion that Megan just might die on the series.

11. Glen's whole existence

Is there any TV character more precociously creepy than Glen Bishop? The kid who lived down the street from the Drapers popped in every once in a while, specifically to weird out audiences with his older-than-his-years ways and his borderline inappropriate relationship with Betty. Remember that time he asked her for a lock of her hair? And she gave it to him?

This whole thing is even weirder when you realize Glen is played by Martin Weiner, Matt Weiner's real life son.

After one last attempt to woo Betty in Episode 10 of Season 7, Glen goes off to fight in Vietnam. Goodbye, Glen. Maybe you and Betty are together in a creepy, alternate universe.

12. Bob's whole existence

Bob Benson was suspicious right from the start. An ambitious young ad man desperate to get in with the folks at SCDP, he was constantly hanging around, fresh cups of coffee in hand and a smile on his face. If you didn't watch this season in real time, it's hard to explain just how maddening this character was.

Fans immediately honed in on the fact that Bob is basically Don Draper 2.0 -- so he must be hiding something.

And of course he was. It's later revealed that his identity was made up -- including his name, college and job experience. It's all made weirder when his friend Manolo elopes with Pete's mom, who later dies while on a cruise ship with her young husband.

13. Nipplegate

Though the show isn't yet over, this might be season 7's most WTF moment -- the character Michael Ginsberg cutting off own his nipple.

Ginsberg slowly descends into madness after a computer is placed in the office. He eventually "realizes" his nipple is the source of craziness and pressure, so he cuts it off ... and gives it to an unsuspecting Peggy in a beautifully wrapped box.

Cut to Ginsberg being taken away to the hospital. That's one hell of a way for a character to go.

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